I lived on a continent where the Russian influence was such that it was called the "Red Scare" until they intervened in Afghanistan and lost and their influence became greatly diminished. It was only then, that South Africa could no longer use the fear of "Communists" and could work toward the dismantling of Apartheid.
And China is manipulating currency, and is heavily involved in Africa - they built the new AU building.
Under apartheid, South Africa was a fascist state with a capitalist economy. The National Party was strongly anti-communist and said they were faced with a 'Rooi Gevaar' or a 'Red Threat'. The apartheid state used the label 'communist' to justify its repressive actions against anyone who disagreed with their policies.
During the Cold War, there was a contest for influence in Africa, between the US and Western powers on the one hand, and the Soviet Union and Eastern bloc countries on the other. Most of newly independent ex-colonies in Africa received military and economic support from one of the Superpowers.
The collapse of the USSR in 1989 meant that the National Party could no longer use communism as a justification for their oppression.
The ANC could also no longer rely on the Soviet Union for economic and military support. By the end of the 1980s, the Soviet Union was in political and economic crisis, and it was increasingly difficult for the
Soviet Government to justify spending money in Africa.
http://www.sahistory.org.za/article/impact-collapse-ussr-south-africa-grade-12